from tkinter import *
from random import *

root = Tk()
c = Canvas(root, width = 500, height = 500, bg = 'lightblue')
c.pack()

color = ['red', 'yellow', 'blue', 'cyan', 'orange']

def random_rectangle(width, height, col):
    x1 = randrange(width)
    y1 = randrange(height)
    x2 = x1 + randint(1, 100)
    y2 = y1 + randint(1, 100)
    c.create_rectangle(x1, y1, x2, y2, fill = col)

for i in range(100):
    random_rectangle(500, 500, 'red')